* The death of the President of Ireland
* The death of the Taoiseach (Prime Minister)
* The death of the Chief Justice of Ireland
* The death of a Minister of the Government of Ireland
* The death of a member of the Oireachtas (Parliament of Ireland)
* The death of a member of the Judiciary of Ireland
* The death of a member of the Defence Forces of Ireland
* The death of a member of the Garda Síochána (Irish police force)
* The death of a distinguished Irish citizen
* The death of a head of state or government of a foreign country
* The occasion of a national disaster or tragedy
The flag is also flown at half-mast on certain other occasions, such as during a period of mourning for a deceased person or on the anniversary of a significant event.